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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa54339f9b38b2216ed8fc6ea40f9c24161fb32a3a8e4d1bf85a88ab3e1f54cd' 
  AND token = 'S9pOIVgQErDz89MdsJ01fh3XY8vijvH0UcjPC1E/NtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}